It looks like one or more of your database fields is too complex to fit in the RAM you have available. See: http://www.sawmill.net/cgi-bin/sawmill7/docs/sawmill.cgi?dp+docs.faq.entry+webvars.entry+dbmemory
for a discussion of database memory usage (this is probably due to a large "itemnums" table).
Building it in pieces won't help; the final itemnums table will be just as large whether you build all at once, or in pieces, and the itemnums table is the problem. In almost all cases, it's best to build a database all at once.
Using a MySQL database will fix it, because it uses normal disk files instead of memory-mapped files for the itemnums table.
A command-line build might help, but only if it's *not* the itemnums table. If there's an error related to the GUI (we fixed one last week like this), then a command-line build might succeed where a GUI build fails. It's definitely worth a try.
There probably won't be any difference between using different versions of Windows.
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Greg Ferrar, Sawmill Product Manager
support@sawmill.net